We've heard the "USS," as in USS Enterprise, explained on screen on more than one occasion as "united space ship" or "united starship." Has any character in actual on-screen dialogue, or in an on-screen written reference such as computer display, explained what "NCC" stands for in Starfleet context? Offhand, I can't think of any such reference. Of course, we know that in real life, "NC" was used in the prefixes of airplane numbers that Matt Jeffries and Gene Roddenberry were familiar with from the military, and that Jeffries simply added an additional "C." But has there ever been an in-universe explanation?
No, although it seems obvious NCC represents the standard registry code, given most Starfleet starships use it with the rare exception of NX for experimental and NAR for civilian ships. But no, it's never been explained what these letters mean. For more information, click here.
Never explained on-screen. A popular theory is that NCC stands for "Naval Commissioning Code", a theory which was given some lip service by one of the writers on the commentary track of the 2009 movie. But it's never been stated or shown in an actual episode or movie (as far as I'm aware).
According to the original 1975 Star Fleet Technical Manual and USS Enterprise Booklet of General Plans by Franz Joseph Schnaubelt, it stands for "Naval Construction Contract". This also cropped up in the novel Dreadnought! by Diane Carey. But if you wanna go strictly by TV/film Trek, then: No.
NCC stands for Nuclear Cosmological Craft. Cosmology means; The study of the formation and nature of the universe.
I've heard "Naval Construction Contract" for decades, and I've occasionally heard "Navigational Contact Code" as an alternative. I don't think I've ever heard "Naval Commissioning Code" before.
Here are the various registry variants I've collected over the years. A couple have appeared on-screen, but most are fan-made: NCC ------- Naval Construction Contract NCC-FXXXX - Naval Construction Contract/Freighter-Tender NCC-SXXXX - Naval Construction Contract/Support Vessel NCC-GXXXX - Naval Construction Contract/General Use NX -------- Naval Experiment NCO ------- Naval Construction Order (For Alternate-Federation Vessels) NDT ------- Naval Detached Transport NSP ------- Naval Science Program NSX ------- Naval SpecialOps Experiment SNC ------- Shi'ar Naval Contract Q --------- Intelligence "Q-Ship" C --------- Contract # (For pre-Federation Vessels) DT -------- Designated Tactical Vessel FCC ------- Fleet Command Crusier FF -------- Frigate Flagship/Fast Frigate FR -------- Freighter (For pre-Federation Vessels) L --------- Luxury/Civilian G --------- General Use SFDD ------ Starfleet Drydock TP -------- Travel Pod Registry NAR ------- Naval Auxiliary Resource/Research NAK ------- Naval Auxiliary Resource - Merchant Marine/Logistics NFT ------- Non-Federation Transport NGL ------- Non-Starfleet General-Purpose Liner
In light of the prefix variants that are canonically witnessed, it would seem that the N in them might stand for "Federation". That is, NFT, NGL, NAR, NSP and NCC are all witnessed in connection with Federation vessels, and that's about the only thing in common between them. It would then appear to follow that "CC" means "Starfleet active service" and "X" means "experimental or prototype"; the other letters don't have such systematic or clear-cut correlation to any observable characteristic... Two other apparent registry prefixes are BTR for a colony ship in DS9 "Paradise", and YLT for an Yridian craft in "Birthright". The former hauled Federation colonists, but that need not invalidate the "N = Federation" model as such - after all, the latter hauled a Klingon Starfleet officer holding Federation citizenship! Timo Saloniemi
I've imagined NCC to be "New Construction Code" to distinguish it from the more maritime sounding "Naval."
I recall they said it was "Navy Civil Catalogue". It flows well with what The Star Trek Encyclopedia says about it: "N" is for Navy, and "C" means "Civil"--that is, non-military.
I've of the opinion that the letters don't actually STAND for anything, as is the case with postal codes (the Canadian equivalent of zip codes, for those who don't know). Now Star Trek hasn't been 100% consistent on this, but my assumption is this: NCC = Operational Starfleet vessel. NX = Experimental Starfleet vessel prototype not yet cleared for active service. Homage to the NX-class ships that served in the mid-22nd Century. NAR = Non-Starfleet Federation vessel. (Unclear if this is used government vessels, civilian vessels, or both). It may only apply to vessels operated by humans, since non-Starfleet Vulcan ships like the T'Pau had a registry that began with NSP. (Perhaps there's a different registry for vessels operated by each member race, i.e. Andorians, Tellarites, Betazoids, etc.) Not sure we'll ever get a sensible explanation of what the USS is. Yes, I know they may have said "United Space Ship" or "United Star Ship" at some point, but what exactly is united about it? Like the concept of no money and of synthehol, it may be best not to look at that too closely.
The "latest" one. (I'd say "current", but...for some strange reason, it hasn't been updated since DS9 ended. Suppose it had to do with the rise of the Net....)
In American usage, the N doesn't stand for anything as far as I can tell; it's just the letter prefix used for United States craft. Some countries have prefixes that stand for the country name, like JA for Japan (although their own name for themselves is Nihon), but apparently not the US. However the second letter does usually stand for something. Commercial craft are NC, gliders are NG, etc. Experimental craft actually are N-X. Although the second letter isn't considered a part of the registration per se, just a category designator. I take it as being short for United Federation of Planets Star Ship. Just as the American "USS" is short for "United States Ship." Personally it bugs me that the usages of an interstellar, interspecies, multicultural Federation are really just American naval or aviation usages. But it's what we're stuck with.
Probably a hold-over from UESPA - United Earth Space Probe Agency. When the United Federation of Planets was formed, they likely preserved the "U" for that very reason. As for the NCC - BK613 gave a good point that honestly never occurred to me in the almost 40 years I've been watching Star Trek. "U.S.S." has periods, implying an abbreviation. "NCC" does not. Holy shit...something just occurred to me...in TOS, have we ever seen anything other than Connies with a registry number? Could not the "CC" in NCC stand for "Constitution Class"? What if the USS Reliant should have been "NMC-1864" for "Miranda Class"? I know that was before "Miranda" was ever assigned as a class name (a name which I never liked to begin with), but is it possible that the letters in the registry could indicate the class name? It's likely an interesting coincidence, but still...